All my littles are working on rhythm reading (and doing a fabulous job, I might add.) To make this visually more appealing I found a wonderful site called Pianimation.com that has wonderful theory and piano ideas. The one I have used in my studio has been the clothesline rhythm cards, where one 4/4 measure is the size of an 8.5×11 sheet of paper.
I have some students that have taken to it, and others that prefer to make it into a work of art before actually reading them! Here they are for download to use at home!